According to the S&W CW-5000 Series Chiller User Manual, the CW-5000 series chillers have a reservoir capacity of 6L or 1.58503 US gallons:




Here are the volume calculations using the external dimensions of the tubes. The tube is actually a hollow cylinder and I could have calculated it more accurately as such, but the difference should be close enough to account for the plumbing.


MACHINE WATTAGETUBE DIMS (mm)TOTAL VOLUME (US Gallons)
601250mm X 55mm0.78
801250mm X 80mm
1.66
1001460mm X 80mm
1.93
1301650mm X 80mm
2.19


Here are the approximate total system coolant capacities by wattage as derived from the above information.


MACHINE WATTAGE
APPROX. TOTAL COOLANT SYSTEM VOLUMEĀ (US Gal.)
602.36
803.24
1003.51
1303.77


These sound a bit high to me so i will separately calculate as a hollow cylinder and factor in the plumbing to see if there is much difference (as time allows).